Hi Eric,

I love your patch! Yet something to improve:

[auto build test ERROR on v5.12-rc6]
[also build test ERROR on next-20210409]
[cannot apply to vfio/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Eric-Auger/SMMUv3-Nested-Stage-Setup-VFIO-part/20210411-195216
base:    e49d033bddf5b565044e2abe4241353959bc9120
config: i386-randconfig-s001-20210411 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-279-g6d5d9b42-dirty
        # https://github.com/0day-ci/linux/commit/8a9991f0409cae6af9a387b8b90dbb7ad004f590
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Eric-Auger/SMMUv3-Nested-Stage-Setup-VFIO-part/20210411-195216
        git checkout 8a9991f0409cae6af9a387b8b90dbb7ad004f590
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from include/linux/vfio.h:16,
                    from drivers/vfio/vfio_iommu_type1.c:37:
   include/uapi/linux/vfio.h:1226:34: error: field 'config' has incomplete type
    1226 |  struct iommu_pasid_table_config config; /* used on SET */
         |                                  ^~~~~~
   drivers/vfio/vfio_iommu_type1.c: In function 'vfio_detach_pasid_table':
   drivers/vfio/vfio_iommu_type1.c:2872:3: error: implicit declaration of function 'iommu_detach_pasid_table'; did you mean 'vfio_detach_pasid_table'? [-Werror=implicit-function-declaration]
    2872 |   iommu_detach_pasid_table(d->domain);
         |   ^~~~~~~~~~~~~~~~~~~~~~~~
         |   vfio_detach_pasid_table
   drivers/vfio/vfio_iommu_type1.c: In function 'vfio_attach_pasid_table':
   drivers/vfio/vfio_iommu_type1.c:2886:9: error: implicit declaration of function 'iommu_uapi_attach_pasid_table'; did you mean 'vfio_attach_pasid_table'? [-Werror=implicit-function-declaration]
    2886 |   ret = iommu_uapi_attach_pasid_table(d->domain, (void __user *)arg);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |         vfio_attach_pasid_table
   drivers/vfio/vfio_iommu_type1.c: In function 'vfio_bind_msi':
>> drivers/vfio/vfio_iommu_type1.c:2915:9: error: implicit declaration of function 'iommu_bind_guest_msi' [-Werror=implicit-function-declaration]
    2915 |   ret = iommu_bind_guest_msi(d->domain, giova, gpa, size);
         |         ^~~~~~~~~~~~~~~~~~~~
>> drivers/vfio/vfio_iommu_type1.c:2922:3: error: implicit declaration of function 'iommu_unbind_guest_msi' [-Werror=implicit-function-declaration]
    2922 |   iommu_unbind_guest_msi(d->domain, giova);
         |   ^~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/iommu_bind_guest_msi +2915 drivers/vfio/vfio_iommu_type1.c

  2904	
  2905	static int
  2906	vfio_bind_msi(struct vfio_iommu *iommu,
  2907		      dma_addr_t giova, phys_addr_t gpa, size_t size)
  2908	{
  2909		struct vfio_domain *d;
  2910		int ret = 0;
  2911	
  2912		mutex_lock(&iommu->lock);
  2913	
  2914		list_for_each_entry(d, &iommu->domain_list, next) {
> 2915			ret = iommu_bind_guest_msi(d->domain, giova, gpa, size);
  2916			if (ret)
  2917				goto unwind;
  2918		}
  2919		goto unlock;
  2920	unwind:
  2921		list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) {
> 2922			iommu_unbind_guest_msi(d->domain, giova);
  2923		}
  2924	unlock:
  2925		mutex_unlock(&iommu->lock);
  2926		return ret;
  2927	}
  2928	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org